<p>Systems Repair Worksheet Chapter 16 Pages 457-500 Name Electrical Diagnosis & Service 70 Points Due Date: 11-13- 12</p><p>1. All Electrical problems can be categorized into one of three categories:</p><p>______that occur when a circuit is incomplete.</p><p>______that occur when a circuit has an unwanted path for current.</p><p>______problems that occur when there is unwanted resistance (corrosion).</p><p>2. An ______problem prevents a circuit from operating. </p><p>A ______to ground reduces resistance and increases current flow to blow the fuse. </p><p>A ______to power or “short-to-hot” energizes an unwanted circuit. </p><p>High resistance in a path reduces ______flow. (less intensity in bulbs, less speed in motors)</p><p>3. Many sensors are fed a ___-volt reference signal. Bad grounds (those with excessive resistance) can result in higher than normal readings back to the PCM from a voltage reference sensor.</p><p>4. Wiring diagrams called ______show how a circuit is constructed or arranged.</p><p>5. Common electric ______are used in schematic drawings. Some feature color-coded wiring that indicates the color of the wire insulation, but no length or location is depicted.</p><p>6. Besides multi-meters, ______wires, test lights and logic probes are used for diagnosis.</p><p>7. Non-powered 12-volt test lights are used to check for voltage ______.</p><p>8. A ______- ______test light is used to check for continuity. </p><p>9. ______are fast reacting meters that measure & display voltage over time.</p><p>10. A good ______can do so much more than just read DTC’s! Be sure to use the serial data stream, check TSB’s, use the pattern failure troubleshooter, and all of the modes.</p><p>11. Jumper wires with a ______or a circuit breaker can be used to by-pass wires or switches. Do not use a jumper wire to by-pass a consumer or a load. The circuit amps will skyrocket.</p><p>12. A computer ______will preserve power to volatile RAMs when the battery is disconnected for service. Note: The SIR system retains its back-up power with a memory saver! </p><p>13. A DMM used on computer circuits should have an input ______of 1 MΩ to 10 MΩ.</p><p>14. A DMM used on high voltage hybrid vehicles should be ANSI & SCA ______1000 V rated.</p><p>15. The auto ______feature on meters detects the proper range & sets the meter to read it. 16. A DMM set to measure volts is connected in ______to a circuit.</p><p>17. Voltage ______tests will find excessive resistance that may not be detected with an ohmmeter.</p><p>18. Ammeters are connected either in series or using ______pickups to measure current.</p><p>19. Ohmmeters are only used on components disconnected from their ______source. (open = OL)</p><p>20. The DMM ______test mode (alert) sounds an audible beep when continuity exists.</p><p>21. The DMM _____ / _____ is a record function that is useful in capturing intermittent problems.</p><p>22. A DMM may also measure ______which is a percentage of circuit on-time.</p><p>______normally measured in milliseconds, and ______in hertz. </p><p>23. On a lab scope, voltage is shown on the ______axis.</p><p>24. On a lab scope, time is shown on the ______axis.</p><p>25. Lab scopes can display momentary electrical noise, disturbances, and signal ______.</p><p>26. An ______scope is a real-time scope. A ______is a Digital Storage Oscilloscope.</p><p>27. Using a DSO, a technician can “ ______” or capture a signal for closer analysis.</p><p>28. A multiple ______DSO can display more than one waveform at a time for comparison.</p><p>29. Waveform amplitude is shown as ______& waveform frequency is shown as ______.</p><p>30. One complete sine wave is a ______. One cycle per second is 1 hertz.</p><p>31. A _____ is a DMM that displays voltage, resistance, current & frequency as a waveform graph.</p><p>32. Many DSOs and GMMs allow capture & transfer of screens & data to a PC. True False</p><p>33. Measuring ______across a fuse or other circuit protection device tells more about its condition than a continuity test.</p><p>34. Some systems, like power seat motors use a PTC ______as circuit protection. When the current is high, the resistance of the thermistor increases to decrease current or even stop flow.</p><p>35. Both manual switches & automatic switches (pressure switch) can be ______checked, checked for continuity, voltage drop checked or even by-passed with a jumper wire to verify operation. </p><p>36. Testing of ______can be done with jumper wires, a volt meter, ohmmeter, or a test light.</p><p>37. The best way to test a stepped resistor is with an ohmmeter. True False 38. An unpowered ______can be “sweep tested” with an ohmmeter, preferably a GMM. 39. The best way to check wiring is to check the ______across it.</p><p>40. When troubleshooting, verify the complaint, then use the wiring diagrams & do quick ______checks of source & ground to narrow the problem down. Complaint - Cause - Correction</p><p>41. When ______probing, using too large of an adapter can deform & loosen terminals.</p><p>42. ______probing is necessary when tests like voltage drop need to be done on a “live” circuit.</p><p>43. If you test wiring by ______through the insulation, cover the damage to prevent corrosion.</p><p>44. For circuit diagnosis a ______diagram is one of the most important sources of information.</p><p>45. Connectors and ______are typically numbered to make location easier. (Cxxx Sxxx Gxxx)</p><p>46. When tracing a circuit on a schematic, start at the ______that is not working, find its source, its ground, its switch or control, and the circuit protection. Then get busy with the DMM.</p><p>47. Printing out the circuit & using a ______to trace it can help avoid confusion.</p><p>48. All circuit issues can be boiled down to 1 of 3 things: _____, ______& high ______. </p><p>49. A component with a shorted coil of wire will read ______than specs or even zero resistance.</p><p>50. A fuse never blows without a reason, probably blown due to a ______to ground.</p><p>51. High resistance problems are typically caused by ______that decreases intensity. (amps)</p><p>52. Many electrical problems can be traced to faulty wiring or ______.</p><p>53. Re-routing wires can result in unwanted ______voltages from electromagnetic fields. </p><p>54. All replacement wires should be the ______size or larger than the original, never smaller.</p><p>55. ______wires (the proper way to connect wires) joins them by melting a lead & tin alloy and allowing it to flow into the joint. 60/40 rosin core solder of a .032” diameter works well</p><p>56. When soldering near heat-sensitive components, use a heat ______to prevent damage.</p><p>57. After crimping & soldering a wire splice, place ______shrink tubing over the splice, and warm it with a heat gun to protect the joint from elements that could cause corrosion & shorts.</p><p>58. Wire terminal ______and release tools prevent connector damage when unlocking terminals.</p>